CN113488228B - Cable and preparation method thereof - Google Patents
Cable and preparation method thereof Download PDFInfo
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- CN113488228B CN113488228B CN202110724595.5A CN202110724595A CN113488228B CN 113488228 B CN113488228 B CN 113488228B CN 202110724595 A CN202110724595 A CN 202110724595A CN 113488228 B CN113488228 B CN 113488228B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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Abstract
The invention discloses a cable which comprises a central conductor and a stranded conductor, wherein the stranded conductor comprises a plurality of special-shaped conductors, the special-shaped conductors are stranded on the outer surface of the central conductor by taking the central conductor as a matrix, and the special-shaped conductors and the central conductor are in surface contact. The invention also discloses a cable manufacturing method. The cable provided by the invention can effectively reduce the gap inside the cable, improves the structural stability, has a simple manufacturing method and process, and is beneficial to saving the cost.
Description
Technical Field
The invention belongs to the technical field of nuclear engineering, and particularly relates to a cable and a preparation method thereof.
Background
Nuclear power plants differ from conventional power plants in that they have high requirements on the quality of the cables due to their particularity.
The cable in conventional power station and transmission links is directly twisted and bundled together a plurality of cylindrical conductor monomers to form a whole, the direct twisting and bundling mode is the main form of the cable at present, however, the cable has gaps in the twisting process, the compression coefficient is large, the cross-sectional area of the cable is large, more consumed materials are caused, the dead weight and the resistance of the cable can be improved, the conductivity of the cable is reduced, in addition, the structure is unstable, the contact among the conductor monomers is not tight, the contact relation is not good, the phenomena of short circuit and the like are easy to occur, and the heating is easy to be caused by poor contact.
In order to overcome the defects, some cables are formed by sequentially twisting single conductors with special-shaped cross sections at present, and although the cables of the type can overcome the defects of the conventional cylindrical single conductors, the special-shaped single conductors cannot be completely and sequentially twisted together because the special-shaped single conductors are irregular in shape and are easy to deflect and misplace in the twisting process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a cable and a preparation method thereof, aiming at the defects in the prior art, the gap in the cable can be effectively reduced, the structural stability is improved, the preparation method is simple in process, and the cost is saved.
According to one aspect of the invention, the invention provides a cable, which adopts the technical scheme that:
a cable comprises a central conductor and a stranded conductor, wherein the stranded conductor comprises a plurality of special-shaped conductors, the special-shaped conductors are stranded on the outer surface of the central conductor by taking the central conductor as a matrix, and the structural shapes of the special-shaped conductors can enable the special-shaped conductors to be in surface contact with each other and enable the special-shaped conductors to be in surface contact with the central conductor.
Preferably, the outer surface of the central conductor is provided with a first twisted line, the twisted conductor is provided with a first matching line, the first matching line is matched with the first twisted line, and the twisted conductor and the central conductor are twisted through the matching of the first matching line and the first twisted line.
Preferably, the first twisted line is a first groove, the first matching line is a first protrusion, the cross section of the first groove is arc-shaped, the depth of the first groove is gradually reduced from the middle to two sides, and first corrugated steps are arranged on two sides of the first groove.
Preferably, the special-shaped conductors are divided into a plurality of groups, each group of special-shaped conductors are twisted to form a twisted layer, each twisted layer is sequentially arranged from inside to outside, and the first matching lines are arranged on the special-shaped conductors in the innermost twisted layer.
Preferably, the cable further comprises a second twisting line and a second matching line, the second twisting line is arranged at the top of the special-shaped conductor in the inner-side twisting layer of the two adjacent layers of twisting layers, the matching line is arranged at the bottom of the special-shaped conductor in the outer-side twisting layer of the two adjacent layers of twisting layers, and the second matching line is matched with the second twisting line.
Preferably, the second twisted lines are second grooves, the second matching lines are second protrusions, the cross sections of the second grooves are arc-shaped, the depth of the second grooves is gradually reduced from the middle to two sides, and second corrugated steps are arranged on two sides of each second groove.
Preferably, the central conductor is cylindrical, the cross section of the special-shaped conductor is trapezoidal, the top and the bottom of the trapezoidal cross section are both arc edges, the bottom of the trapezoidal cross section faces the central conductor, the first matching lines/the second twisted lines/the second matching lines are all arranged on the arc edges of the special-shaped conductor, and the cylindrical surface of the central conductor and the arc surface of the special-shaped conductor have the same radian and are in close surface contact.
Preferably, the cable further comprises a plurality of calibration holes and calibration rods, wherein the calibration holes are formed in the central conductor and distributed along the length direction of the central conductor; the bottom end of the calibration rod is arranged in the twisted calibration hole, and the top end of the calibration rod extends outwards from the twisted gap between two adjacent special-shaped conductors and is flush with the outer surface of the twisted conductor.
Preferably, the cable further comprises a fill-in coating and/or an insulating layer, the fill-in coating being disposed between the center conductor and the stranded conductors and between the stranded layers; the insulating layer is arranged on the outer surface of the outermost twisted layer.
Preferably, a heat dissipation channel is provided in the central conductor.
According to another aspect of the invention, a cable manufacturing method is provided, which adopts the technical scheme that:
a method of making a cable, comprising:
pretreating the outer surface of the central conductor;
pretreating the surface of the special-shaped conductor;
and sequentially twisting the special-shaped conductors on the outer surface of the central conductor in a surface contact mode according to the sequence.
Preferably, before the twisting the shaped conductor on the outer surface of the center conductor in sequence, further comprises: according to the specification of the special-shaped conductor, a calibration rod is arranged on the central conductor.
Preferably, the step of providing the calibration bar comprises:
measuring the width d of the cross section of the special-shaped conductor, and determining the length l of the twisted special-shaped conductor along the axial direction of the central conductor;
determining the maximum twisting length L of the special-shaped conductor according to the ratio of d/L;
within each range of the maximum twist length L, a calibration bar is provided.
Preferably, the twisting includes:
smearing a leveling coating on the outer surface of the pretreated central conductor, and twisting the special-shaped conductor on the outer surface of the central conductor before the leveling coating is cured and formed to obtain a first twisted layer;
grinding and polishing the surface of the first twisted layer, and smearing a filling-in coating;
then, the stranding of the next stranding layer was carried out according to the above procedure until the overall conductor structure of the cable was obtained.
The cable is formed by twisting special-shaped conductors, the central conductor is arranged at the central position to serve as a twisted base body, the direct twisting mode in the prior art is distinguished, surface contact is adopted among the special-shaped conductors and between the special-shaped conductors and the central conductor, and the point contact mode among cylindrical conductors in the prior art is distinguished, so that the gap inside the cable can be effectively reduced, the tightness degree among the twisted special-shaped conductors is improved, the structural stability is improved, the sectional area of the cable is reduced, the resistance is effectively reduced, and the conductive capacity of the cable is improved.
According to the manufacturing method of the cable, the central conductor is arranged at the central position to serve as the twisted base body, and the special-shaped conductors and the central conductor are in surface contact.
Drawings
FIG. 1 is a schematic view of a cable according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the point A in the example of the present invention;
FIG. 3 is a side view of a cable in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a calibration rod according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a cable manufacturing method according to an embodiment of the present invention.
In the figure: 1-a central conductor; 2-a stranded conductor; 3-an insulating layer; 4-a first twist; 5-a stranding layer; 6-leveling the coating; 7-a profiled conductor; 8-first mating line; 9-heat dissipation channel; 10-a first corrugated step; 11-a calibration bar; 12-limiting groove.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the indication of orientation or positional relationship, such as "on" or the like, is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplicity of description, and does not indicate or imply that the device or element referred to must be provided with a specific orientation, constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "disposed," "mounted," "fixed," and the like are to be construed broadly, e.g., as being fixedly or removably connected, or integrally connected; either directly or indirectly through intervening media, or through the interconnection of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
Example 1
As shown in fig. 1, the present embodiment discloses a cable, which includes a central conductor 1 and a stranded conductor 2, wherein the stranded conductor 2 includes a plurality of special-shaped conductors 7, the plurality of special-shaped conductors 7 are sequentially stranded on an outer surface of the central conductor 1 with the central conductor 1 as a matrix to form the stranded conductor 2, and a structural shape of each special-shaped conductor enables surface contact between the different-shaped conductors and between the special-shaped conductors and the central conductor.
The cable of the present embodiment is formed in a unitary structure by arranging the center conductor 1 as a twisted base body at a center position of the cable and sequentially twisting on the base body. Compared with the structure formed by direct twisting in the prior art, the structure can effectively reduce the gap inside the cable, improve the tightness between the twisted special-shaped conductors 7, reduce the sectional area of the cable and effectively reduce the resistance.
In this embodiment, the material of the central conductor 1 is the same as that of the stranded conductor 2, so as to form an integral conducting structure. The central conductor 1 is preferably a cylindrical solid conductor with a circular cross-section.
In some embodiments, the heat dissipation channel 9 is provided in the central conductor 1, that is, the central conductor 1 may be a hollow conductor as well as a solid conductor. The cooling medium is arranged in the heat dissipation channel 9 to promote heat dissipation and temperature reduction.
In this embodiment, the cooling medium may be in a gas phase, such as air, or in a liquid phase, such as circulating cooling water.
In some embodiments, as shown in fig. 2, a first twisted line 4 is arranged on an outer surface of the central conductor 1, a first matching line 8 is arranged on the twisted conductor 2, the first matching line 8 is matched with the first twisted line 4, and the twisted conductor 2 and the central conductor 1 are twisted and fixed by matching the first matching line 8 and the first twisted line 4, so that the problems that the special-shaped conductor 7 in the prior art is easy to loosen during twisting, difficult to twist according to a preset track and the like are solved, and the structural stability is improved.
Specifically, the first twisted pattern 4 may be a first groove disposed on the outer surface of the center conductor 1, and correspondingly, the first mating pattern 8 is a first protrusion disposed on the twisted conductor 2. The cross section of the first groove is preferably arc-shaped, and the depth of the first groove is gradually reduced from the middle to two sides.
Of course, the first twisted pattern 4 may also be a first protrusion disposed on the outer surface of the center conductor 1, and correspondingly, the first mating pattern 8 is a first groove disposed on the twisted conductor 2. That is, the first twisting thread 4 and the first fitting thread 8 may also be provided in a reverse manner to the above-described arrangement state.
It should be noted that the depth of the first groove and the height of the first protrusion should not damage the continuity, uniformity, and electric field distribution of the surface of the center conductor 1 or the stranded conductor 2. In practical operation, since the twisting is performed by a large force during the twisting process, the twisting fixation can be realized only by the existence of the first groove, and the existence of the first twisting thread 4 and the first matching thread 8 has the significance of providing a dominant twisting channel, which is convenient for realizing the twisting.
In some embodiments, as shown in fig. 2, two sides of the first groove may be provided with first corrugated steps 10, and the first corrugated steps 10 may perform a transition function on the first groove and the first protrusion (including the surface of the stranded conductor), so as to avoid that the slope of the non-continuous surface on the same surface is large to affect the stranding effect.
In some embodiments, all the special-shaped conductors 7 are divided into a plurality of groups, the twisted conductor 2 includes a plurality of twisted layers 5, the twisted layers 5 are independent of each other, the special-shaped conductors 7 of each group are twisted in sequence to form one twisted layer 5, and the twisted layers 5 are sequentially arranged from inside to outside and then combined into the twisted conductor 2.
Of course, the stranded conductor 2 may also be only one stranded layer 5, i.e. all the profiled conductors 7 are in one group, and all the profiled conductors 7 are stranded together in order.
In some embodiments, the cable further includes a second twisting line (not shown in the figure) and a second matching line (not shown in the figure), the second twisting line is disposed on the top of the special-shaped conductor 7 in the inner-side twisting layer 5 of the two adjacent twisting layers 5, the second matching line is disposed on the bottom of the special-shaped conductor 7 in the outer-side twisting layer 5 of the two adjacent twisting layers 5, and the second matching line is matched with the second twisting line, that is, the twisting fixation is performed between the twisting layers 5 through the matching of the second matching line and the second twisting line, which not only makes the special-shaped conductor 7 in each twisting layer 5 not easily loose during twisting, but also makes each special-shaped conductor 7 twisted according to a set track, and improves the structural stability of the twisted conductor 2.
Specifically, the second twisting line may be a second groove disposed at the top of the irregular-shaped conductor 7 in the inner twisting layer 5 of the two adjacent twisting layers 5, and correspondingly, the second matching line is a second protrusion disposed at the bottom of the irregular-shaped conductor 7 in the outer twisting layer 5 of the two adjacent twisting layers 5. The cross section of the second groove is preferably arc-shaped, and the depth of the second groove is gradually reduced from the middle to two sides.
Of course, the second twisting line may also be a second protrusion disposed on the top of the special-shaped conductor 7 in the inner twisting layer 5 of the two adjacent twisting layers 5, and correspondingly, the second matching line is a second groove disposed on the bottom of the special-shaped conductor 7 in the outer twisting layer 5 of the two adjacent twisting layers 5. That is, the second twisting thread and the second fitting thread may also be provided in a reverse manner to the above-described arrangement state.
It should be noted that the depth of the second groove and the height of the second protrusion should not damage the continuity, uniformity, and electric field distribution of the surface of the shaped conductor 7 in each layer of the twisted layer 5. In practical operation, as the twisting is carried out by a large force in the twisting process, the twisting fixation can be realized only by the existence of the second groove and the second protrusion, and the existence significance of the second twisting pattern and the second matching pattern is to provide a twisting dominant channel, so that the twisting is convenient to realize.
In some embodiments, both sides of the second groove may be provided with a second corrugated step (not shown in the drawings), and the second corrugated step performs a transition effect on the second groove and the second protrusion (including the surface of the stranded conductor), so as to avoid that the slope of the non-continuous surface on the same surface is larger to affect the stranding effect.
In some embodiments, the cross section of each of the special-shaped conductors 7 is trapezoidal, more precisely, the cross section of each of the special-shaped conductors 7 is approximately trapezoidal, and both the upper bottom and the lower bottom of the trapezoidal cross section are arc-shaped sides, wherein the lower bottom of the trapezoidal cross section faces the central conductor 1, the first matching lines 8/the second matching lines are all arranged on the arc-shaped surface of the special-shaped conductor 7, and the arc of the cylindrical surface of the central conductor 1 is the same as that of the arc-shaped surface of the special-shaped conductor 7, so as to achieve close surface contact.
Specifically, the first fitting striations 8 are arranged on the bottom arc-shaped edge of the profiled conductor 7 in the innermost stranded layer 5. The second transposition line is arranged on the arc-shaped top edge of the special-shaped conductor 7 in the inner-side transposition layer 5 in the two adjacent layers of transposition layers 5, and the second matching line is arranged on the arc-shaped bottom edge of the special-shaped conductor 7 in the outer-side transposition layer 5 in the two adjacent layers of transposition layers 5. The twisting layers 5 formed by the special-shaped conductors 7 are circular, and the circular twisting layers 5 are concentric, so that gapless twisting and fixing of the interior of the cable are realized.
In some embodiments, as shown in fig. 3, the present cable further comprises a calibration hole, a calibration rod 11, wherein: the calibration holes are arranged on the central conductor 1, the number of the calibration holes is multiple, the calibration holes are uniformly distributed along the length direction of the central conductor at a certain interval, the specific interval can be selected according to the width of the special-shaped conductor, for example, the interval between two adjacent calibration holes can be an integral multiple of the width of the special-shaped conductor; the bottom end of the calibrating rod 11 is arranged in the calibrating hole, and the top end of the calibrating rod extends outwards from the twisting gap of two adjacent special-shaped conductors 7 and is flush with the outer surface of the special-shaped conductor 7 in the outermost twisting layer 5 of the twisted conductor 2. Through setting up the alignment rod 11, not only can carry on spacingly to special-shaped conductor 7 in cable axial direction, can also carry on spacingly to special-shaped conductor 7 in the radial direction of cable to can prevent that special-shaped conductor 7 from taking place not hard up, popping out, standing up scheduling problem in the transposition process, ensure cable structure's stability and ensure that each special-shaped conductor 7 fixes on central conductor 1 according to predetermineeing the orbit transposition.
Specifically, the calibration rod 11 is made of an insulating material, the top end of the calibration rod 11 is preferably in a T shape, and a force applied to the central conductor 1 by the stranded conductor 2 can be applied, so that the abnormal-shaped conductor 7 is prevented from popping up and turning over. As shown in fig. 4, the calibrating rod 11 may be provided with a limiting groove 12, and the size of the limiting groove 12 is adapted to the thickness of one or more of the twisting layers 5, so that the deformed conductor 7 in the twisting layer 5 is clamped in the limiting groove 12.
In the present embodiment, the interval of the calibration bars 11 does not exceed the maximum twisting length L of the shaped conductor 7, which can be determined based on the ratio of d/L, wherein the width of the cross section of the shaped conductor 7, the length L in the axial direction of the center conductor 1 after twisting.
The embodiment determines the maximum twisting length L based on the ratio of d/L, so that the tension generated by twisting the conductor in the cable can be reduced, and the adverse effect of the internal stress generated by twisting the conductor in the cable on the whole structure of the conductor can be reduced.
In some embodiments, the present cable further comprises a leveling coating 6 and/or an insulating layer 3, wherein: the filling-in coating 6 is arranged between the central conductor 1 and the stranded conductor 2 and between the stranded layers 5 and is used for filling gaps possibly existing at the position so as to ensure gapless stranding fixation; the insulating layer 3 is provided on the outer surface of the outermost twist layer 5.
It should be noted that the cable structure in this embodiment may be used for a cable of a nuclear power plant, and of course, may also be applied to cables in other fields, and is not limited to being used for a cable of a nuclear power plant.
The cable of this embodiment, adopt the special-shaped conductor transposition to form, and, through set up the base member of center conductor as the transposition in central point, be different from the direct transposition mode among the prior art, and between each special-shaped conductor, be surface contact between special-shaped conductor and the center conductor, be different from the point contact mode between the cylindrical conductor among the prior art, thereby can effectively reduce the inside clearance of cable, improve the inseparability degree between the special-shaped conductor after the transposition, not only improved structural stability, still reduced the sectional area of cable, effectively reduced resistance, the conducting capacity of cable has been improved.
In addition, the first twisting grains, the first matching grains, the second twisting grains and the second matching grains are arranged, so that the problems that the special-shaped conductor in the prior art is easy to loosen and is difficult to twist according to a preset track during twisting can be further solved, and the structural stability is further improved; the calibration rod is arranged, so that the special-shaped conductor can be limited, the special-shaped conductor is prevented from loosening and popping up in the twisting process, the stability of the cable structure is ensured, and various special-shaped conductors are twisted and fixed on the central conductor according to a preset track; the special-shaped conductors are arranged to be arc-shaped trapezoid in cross section, so that the conductors in the cable can be attached more tightly, and real gapless twisting is realized; through setting up heat dissipation channel, can improve the heat dispersion of cable.
Example 2
As shown in fig. 5, the present embodiment discloses a method for manufacturing a cable, including:
pretreating the outer surface of the central conductor;
pretreating the surface of the special-shaped conductor;
and sequentially twisting the special-shaped conductors on the outer surface of the central conductor in a surface contact mode according to the sequence.
In this embodiment, as shown in fig. 1, the pre-treating the surface of the central conductor 1 specifically includes: straightening the central conductor 1 through a straightening machine, removing impurities on the surfaces of the central conductor 1 and the special-shaped conductor 7, and enabling the surfaces of the central conductor to be smooth, and meanwhile, polishing and polishing the surfaces of the central conductor 1 and the special-shaped conductor 7 to achieve preset roughness (specifically selecting according to actual requirements), so that the integral structure can be formed by better fitting during twisting, and gaps generated by twisting are reduced.
In this embodiment, as shown in fig. 1, the cross section of the central conductor 1 is circular or annular. The special-shaped conductor 7 is preferably the special-shaped conductor 7 with the trapezoidal cross section surface, and the upper bottom and the lower bottom of the cross section of the special-shaped conductor 7 are arc edges so as to ensure that the special-shaped conductor can be better attached to the outer surface of the central conductor 1 during twisting. Moreover, as the special-shaped conductor 7 with the trapezoidal cross section is adopted, compared with a conventional conductor, the cable formed by twisting the special-shaped conductor 7 is troublesome from design to production, in order to ensure that all layers are tightly attached during twisting, not only the arrangement structure of the special-shaped conductor 7 in each layer of twisted layer 5 and the structure of a single special-shaped conductor 7 need to be refined, but also the trapezoidal special-shaped conductor 7 is more easy to loosen after twisting compared with the conventional conductor, in order to prevent the special-shaped conductor 7 from loosening and turning over, the various special-shaped conductors 7 need to be twisted according to a preset track, if the requirements are not met, gaps can be easily generated during subsequent twisting, and once the gaps are generated, the problem that the twisting force is not increased like the conventional conductor twisting can be solved. Therefore, in order to ensure that the above requirements can be met, as shown in fig. 2, a first twisted line 4 is provided on the outer surface of the central conductor 1, a first matching line 8 matched with the first twisted line 4 is provided on the profiled conductor 7 adjacent to the central conductor 1, and when the twisted conductor 2 formed by twisting the profiled conductor 7 includes a plurality of twisted layers 5, a second twisted line and a second matching line are respectively provided on the profiled conductor 7 in two adjacent layers 5, and the profiled conductors 7 are twisted and fixed according to a preset track by matching the first twisted line 4 with the first matching line 8 and matching the second twisted line with the second matching line.
In some embodiments, before sequentially stranding the shaped conductor 7 on the outer surface of the center conductor 1 in order, the method further includes: as shown in fig. 3, according to the specification of the special-shaped conductor 7, the calibration rod 11 is arranged on the central conductor 1, so that the problems of looseness, pop-up, turning over and the like of the special-shaped conductor 7 in the twisting process can be further prevented, the stability of the cable structure is ensured, and the special-shaped conductors 7 are twisted and fixed on the central conductor 1 according to a preset track. The number of the calibration rods is multiple, and the multiple calibration rods 11 are arranged at a certain spacing distance along the length direction of the central conductor, for example, the spacing distance between two adjacent calibration rods 11 is an integral multiple of the width of the special-shaped conductor.
In some embodiments, the spacing distance of the calibration rods 11 may also be no more than the maximum twist length L, in which case the step of providing the calibration rods 11 includes:
measuring the width d of the cross section of the special-shaped conductor 7, and determining the length l along the axial direction of the central conductor 1 after twisting;
determining the maximum twisting length L of the special-shaped conductor 7 according to the ratio of d/L;
within each range of the maximum twist length L, one calibration rod 11 is provided.
Specifically, after the maximum twisting length L of the special-shaped conductor 7 is determined according to the ratio of d/L, a calibration hole is arranged in the range of every other maximum twisting length L along the axial direction of the central conductor 1, and the position of the calibration hole is ensured to be opposite to the twisting gap between two adjacent special-shaped conductors 7, so that the calibration rod 11 is ensured to be positioned in the twisting gap between two adjacent special-shaped conductors 7 during twisting. One end (bottom end) of the aligning bar 11 is fixed in the aligning hole by an insulating material such as an insulating resin.
In this embodiment, the spacing distance of the calibration rod 11 is set based on the maximum twisted length L, so that the tension generated by twisting the conductor in the cable can be reduced, and the adverse effect of the internal stress of the inner twist of the conductor in the cable on the overall structure of the conductor can be reduced.
In some embodiments, the top end of the calibration rod 11 is T-shaped, the attachment depth and the attachment point are divided according to the height of the special-shaped conductor 7 (i.e. the distance between the upper bottom and the lower bottom in the cross section of the special-shaped conductor 7) at the relative position on the calibration rod 11, and are polished to form a limiting groove, and when twisted, the special-shaped conductor 7 is clamped in the limiting groove to realize limiting. The number of the limiting grooves can be one or more, and the limiting grooves are sequentially arranged along the length direction of the calibration rod 11. The size of each limiting groove is adapted to the thickness of one or more stranding layers 5.
In some embodiments, the stranding process includes:
firstly, smearing a filling-up coating 6 on the outer surface of a pretreated central conductor 1, and then twisting a special-shaped conductor 7 on the outer surface of the central conductor 1 before the filling-up coating 6 is cured and formed to obtain a first twisted layer 5 of the twisted conductor 2, wherein the filling-up coating 6 can fill up gaps possibly existing in subsequent twisting;
the surface of the first twisting layer 5 is ground and polished to eliminate the problems of deformation and the like of the special-shaped conductor 7 caused by uneven stress and the like in the twisting process, and the filling-up coating 6 is coated again to fill up the gap generated by twisting;
then, when stranded conductor 2 includes multilayer stranded layer 5, carry out the transposition of next layer stranded layer 5 according to above-mentioned step until obtaining the inside whole conductor structure of cable, afterwards, rethread extruder at the outer cladding insulating layer 3 of whole conductor structure, obtain complete cable, when stranded conductor 2 only includes one deck stranded layer 5, directly through the extruder at the outer cladding insulating layer 3 of first stranded layer 5.
According to the manufacturing method of the cable, the central conductor is arranged at the central position to serve as the twisted base body, so that the different-shaped conductors are in surface contact with each other, and the different-shaped conductors and the central conductor are in surface contact with each other.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (11)
1. A cable is characterized by comprising a central conductor (1), a stranded conductor (2), a calibration hole and a calibration rod (11), wherein the stranded conductor comprises a plurality of special-shaped conductors (7), the special-shaped conductors are stranded on the outer surface of the central conductor by taking the central conductor as a matrix, and the structural shape of each special-shaped conductor can ensure that the special-shaped conductors are in surface contact with each other and the special-shaped conductors are in surface contact with the central conductor;
the calibration holes are arranged on the central conductor, the number of the calibration holes is multiple, and the calibration holes are distributed along the length direction of the central conductor;
the bottom end of the calibration rod is arranged in the calibration hole, and the top end of the calibration rod extends outwards from the twisting gap between two adjacent special-shaped conductors and is flush with the outer surface of the twisted conductor.
2. The cable according to claim 1, wherein the outer surface of the central conductor is provided with a first twisted pattern (4), the twisted conductor is provided with a first matching pattern (8), the first matching pattern is matched with the first twisted pattern, and the twisted conductor and the central conductor are twisted through the matching of the first matching pattern and the first twisted pattern.
3. The cable of claim 2, wherein the first twist print is a first groove, the first mating print is a first protrusion,
the cross section of the first groove is arc-shaped, the depth of the first groove is gradually reduced from the middle to two sides, and first corrugated steps (10) are arranged on two sides of the first groove.
4. A cable according to claim 2, wherein the profiled conductors are divided into a plurality of groups, each group of profiled conductors is twisted to form a layer of twisted layers (5), each layer is arranged from inside to outside, and the first matching lines are arranged on the profiled conductors in the innermost layer of twisted layers.
5. The cable of claim 4, further comprising a second lay pattern and a second mating pattern,
the second twisted lines are arranged at the top of the special-shaped conductor in the twisted layer close to the inner side in the two adjacent twisted layers, the matching lines are arranged at the bottom of the special-shaped conductor in the twisted layer close to the outer side in the two adjacent twisted layers,
and the second matching lines are matched with the second twisting lines.
6. The cable of claim 5, wherein the second stranding pattern is a second groove, the second mating pattern is a second protrusion,
the cross section of the second groove is arc-shaped, the depth of the second groove is gradually reduced from the middle to two sides, and second corrugated steps are arranged on two sides of the second groove.
7. The cable of claim 5, wherein the central conductor is cylindrical, the cross section of the special-shaped conductor is trapezoidal, the top and the bottom of the trapezoidal cross section are both arc-shaped edges, the bottom of the trapezoidal cross section faces the central conductor, the first matching lines/the second twisting lines/the second matching lines are all arranged on the arc-shaped edges of the special-shaped conductor, and the cylindrical surface of the central conductor and the arc-shaped surface of the special-shaped conductor have the same radian and are in close surface contact.
8. Cable according to any of claims 4 to 7, further comprising a levelling coating (6) and/or an insulating layer (3),
the filling-in coating is arranged between the central conductor and the stranded conductor and between the stranded layers;
the insulating layer is arranged on the outer surface of the outermost stranded layer.
9. A cable according to claim 8, characterized in that a heat dissipation channel (9) is provided in the central conductor.
10. A method of making a cable, comprising:
pretreating the outer surface of the central conductor;
pretreating the surface of the special-shaped conductor;
sequentially twisting the special-shaped conductors on the outer surface of the central conductor in a surface contact mode according to the sequence;
wherein before twisting the shaped conductor on the outer surface of the center conductor in order, further comprising: according to the specification of the special-shaped conductor, a calibration rod is arranged on the central conductor, and the step of arranging the calibration rod comprises the following steps:
measuring the width d of the cross section of the special-shaped conductor, and determining the length l of the twisted special-shaped conductor along the axial direction of the central conductor;
determining the maximum stranding length L of the special-shaped conductor according to the d/L ratio;
within each range of the maximum twist length L, one calibration rod is provided.
11. The method of making a cable according to claim 10, wherein said stranding comprises:
smearing a leveling coating on the outer surface of the pretreated central conductor, and twisting the special-shaped conductor on the outer surface of the central conductor before the leveling coating is cured and formed to obtain a first twisted layer;
grinding and polishing the surface of the first twisted layer, and smearing a filling-in coating;
then, the stranding of the next stranding layer was carried out according to the above procedure until the overall conductor structure of the cable was obtained.
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| CN202110724595.5A CN113488228B (en) | 2021-06-29 | 2021-06-29 | Cable and preparation method thereof |
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| CN113488228B true CN113488228B (en) | 2023-01-31 |
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| JPH0628926A (en) * | 1992-03-30 | 1994-02-04 | Tatsuta Electric Wire & Cable Co Ltd | Elemental wire for electric wire, manufacture thereof, and water-tight insulated electric wire |
| JP2008135196A (en) * | 2006-11-27 | 2008-06-12 | Yazaki Corp | Flame-resistant polyethylene insulation wire |
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| CN103489503A (en) * | 2012-06-12 | 2014-01-01 | 深圳市奔达康电缆股份有限公司 | Twisted structure of metal wires for cables, equipment and manufacturing process of twisted structure |
| CN211125083U (en) * | 2020-02-25 | 2020-07-28 | 湖南洣水河电缆有限公司 | Tile-shaped cutting cable |
| CN212750397U (en) * | 2020-08-10 | 2021-03-19 | 江苏远通电缆有限公司 | Special-shaped wire stranded cable conductor |
| CN112885535A (en) * | 2021-03-19 | 2021-06-01 | 重庆泰山电缆有限公司 | Anti-turn over cable conductor structure |
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2021
- 2021-06-29 CN CN202110724595.5A patent/CN113488228B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0628926A (en) * | 1992-03-30 | 1994-02-04 | Tatsuta Electric Wire & Cable Co Ltd | Elemental wire for electric wire, manufacture thereof, and water-tight insulated electric wire |
| JP2008135196A (en) * | 2006-11-27 | 2008-06-12 | Yazaki Corp | Flame-resistant polyethylene insulation wire |
| CN103489503A (en) * | 2012-06-12 | 2014-01-01 | 深圳市奔达康电缆股份有限公司 | Twisted structure of metal wires for cables, equipment and manufacturing process of twisted structure |
| CN202736555U (en) * | 2012-08-10 | 2013-02-13 | 华通古河（唐山）线缆有限公司 | Longitudinally pressure-resistant sealing oil-submerged pump cable with stranded conductor |
| CN211125083U (en) * | 2020-02-25 | 2020-07-28 | 湖南洣水河电缆有限公司 | Tile-shaped cutting cable |
| CN212750397U (en) * | 2020-08-10 | 2021-03-19 | 江苏远通电缆有限公司 | Special-shaped wire stranded cable conductor |
| CN112885535A (en) * | 2021-03-19 | 2021-06-01 | 重庆泰山电缆有限公司 | Anti-turn over cable conductor structure |
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|---|---|
| CN113488228A (en) | 2021-10-08 |
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